I'm saying that's what the definition of a Clos network is,
and that's the only situation in which it's "non-blocking".
People buy clusters with all kinds of network configurations.
On Thu, Feb 06, 2014 at 09:51:10PM -0600, Alan Louis Scheinine wrote:
> When I wrote "the number of nonblocking con
When I wrote "the number of nonblocking connections is typically
much less than the number of nodes" I had in mind the telephone
network (in the age of copper wires). Are you sure that "1/2 the
nodes can make a single call to the other 1/2 of the nodes" is
typical of a computer interconnect? I t
On 2/6/2014 9:30 AM, Aaron Knister wrote:
Bill Wichser princeton.edu> writes:
We have tested using c1 instead of c0 but no difference. We don't use
logical processors at all. When the problems happens, it doesn't matter
what you set the cores for C1/C0, they never get up to speed again
witho
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On 31/01/14 07:57, Mark Hahn wrote:
> For instance, I've heard some complaints about doing MPI on virtualized
> interconnect as being slow. but VM infrastructure
> like KVM can give device ownership to the guest, so IB access *could* be
> bare-metal.
Bill Wichser princeton.edu> writes:
>
> We have tested using c1 instead of c0 but no difference. We don't use
> logical processors at all. When the problems happens, it doesn't matter
> what you set the cores for C1/C0, they never get up to speed again
> without a power cycle/reseat. We be
On 2/5/14 11:49 PM, "Greg Lindahl" wrote:
>In the usual Clos network, 1/2 of the nodes can make a single call to
>the other 1/2 of the nodes. That's what's non-blocking. Nothing else
>is. Running any real code, every node talks to more than one other
>node, and the network is not non-blocking.
http://www.theregister.co.uk/2014/01/31/hpc_implications_lenovo_ibm_system_x/
Well worth looking at the comments also.
Dr John Hearns | CFD Hardware Specialist | McLaren Racing Limited
McLaren Technology Centre, Chertsey Road, Woking, Surrey GU21 4YH, UK
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A good article on Clos Networks.
http://m.networkworld.com/community/blog/clos-networks-%E2%80%93-what%E2%80%99s-old-new-again
What goes around comes around!
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